Multiple-lift screw jack



March z5, 1930. l. VON k. Hff I 1,751,738

MULTIPLE LIFT scREw JACK Filed March l5, 1926 A TTORN Y Patented Mar. 25, 193.0'y

UNITED s'rA'rlesv PATENT ol-rlcsv y ION VON KERT HOTT, or DAYTON, OHIO, AssIeNoR To THE JOYCE- QRIDLAND GOM?- PANY, or DAYTON, OHIO, A CORPORATION or OHIO MULTIPLE-MET sonnw 'JACK .Application mea March 13, 192e. seriai No. 94,396.

.The invention relates to multiple lift screw jacks and one object of the invention is to provide such a jack in which all threaded parts will be protected.

A further object of the invention is to provde such a jack having a plurality of cham'- bers to contain lubricant.

A further object of the invention is to proA vide suoli a jackA with means whereby the Operating crank may be applied to Vone part thereof to aotuate the jack andto another part thereof to lift the jack as a whole, to place the same under the part to be lifted.

Other objects of the invention will appear as the jack is described in detail. In the accompanying drawings Fig. 1 isa side elevation of a jack embodying my invention; and Fig. 2 is a vertical sectional view taken centrally through such a jack.

In these drawings I have illustrated one embodiment of my invention but itv will be understood that this particular embodiment has been chosen for the purpose of illustration only and that the parts may take vari-y ous forms and may be arranged in various ways without departing from the spirit of p the invention. v

As here shown, the jack comprises a hollow standard 1 having an enlarged lower portion 2 constituting a base. The upper portion of the standard is cylindrical andisv provided with internal screw threads 3f Mounted within the threaded portion of the standard and engaging the threads thereof is an axially movable member,.which is preferably in the form of a nut 4, adapted to travel lengthwise of the standard. lRigidly secured to the nutte is a screw 5, which, in the present instance, is hollow and has an un threaded lower portion G extendingthrough the nut 4 and rigidly secured thereto, as-by means of a pin 7, thus causing the nut and the screw to rotate in unison. Mounted for axial movement to the standard is a hollow llifting element 8 the lower portion of which Consequently Y will move axially of the standard with the nut ,and the rotation of the screw Will cause the lifting element to move axially with relation tothe nut, thus providing a multiple lift for the lifting element. Interposed between the standard and the lifting element is a sleeve 10 which has axial movement with t-he nut and which is so connected with the standard as to beheld against rotation therewith and is so connected with the lifting element las to hold the latter against rotation with relation to the'- sleeve. Further, this sleeve cooperates kwith parts carried by the standard and the lifting element to limit the outward movement of the 'sleeve and nut with relation. to the standard and'to limit the outward movement of the lifting element is provided in one side with a longitudinal v slot 11 into which extends a stud 12 mounted in-thestandard l near the top thereof. ,The sleeve has a second slot 13 which, in the present instance, is arranged opposite the slot 11 and into which extends a stud, such asa screw. l

14, carried by the-lower portion of the lifting element.

The nnte andscrew 5 may-be rotated in any` suitable manner but preferably the screw is hollow and-an actuating bar 15 is rotatably y mounted in the hase 2 ofthestandard and leX- tends into the hollow screw, the-opening in the screw-'and the actuating bar-being non circular in Lcross section lso that the screw, and the nut which is rigidly secured thereto, will be caused to rotate with the actuating har and will have free sliding movement with relation thereto. Rigidly secured to the actuating-bar 15 and arranged within the base 2 is a beveled gear 16 with which meshes a beveled pinion 17 Vjournaled Ain a bearing 18 in the sidewall of the base` and having at its outer end a squared stud 19 adapted to re ceive a socket 2O carried by an operating;

member or crank 21. Obviously the rotation of this crank when applied to the stud 19 will actuate the gear 16, screw 5 and nut. 4, thus imparting axial movement to the lifting element.

It is often necessary to place a jack of this kind under a part to be lifted which is more or less diiicult of access, such, for example, as the axle of an automobile. In order that the jack may be conveniently lifted as a whole and moved into its proper position with relation to the part vto be lifted I have secured to the standard`1 a stud 22, which, in the present instance, comprises the enlarged head of the stud 12. This Studis adapted to receive the socket20 of the operating crank 21 and isgso arranged that the jack may be conveniently lifted by the crank Y. It will be-'noted that the arrangement of the mechanism is such as to provide a series of :chambers adapted vto receiveV lubricant. Foriexample, the base and the hollow lifting element lmayfboth contain lubricant andV lubricant'may also be placed in the standardbetween the lifting'element and the nut. In thismanner the several operating parts are tlioroughlylubricated.at all'tirnes and there islittle,'if any, tendency for thegrease to Vwork out to the exterior of the jack.

TVhileI have shown and described one em-V bodiment of my invention 1I wish it to be understood that I do not desire to be limitedto the detailsl thereof as various modifications mayfoccurito aperson skilled in the art.

l Having now fully described my invention, what `I claim as new and desire to secure by Letters'Patent, is: 1* n 1. In a lifting jack, a hollow standard having-finternal screw threads, a member rotatably mounted insaid standard and having threads engaging the threads of said standard",ja"screw mounted'insaid standard, conafliftingelement having threaded engage-f ment with said screw, meansv for rotating said threaded member and said screw, and means for holding said lifting element against rotation with said screw.

3. 'In a lifting jack, a hollow standard having internall screw threads, a member rotatablymounted in said standard and having f threadsengaging the threads of said standard, a screw rigidly secured to said member,

" a' vvhollow lifting element having internal screw threads to receive said screw, and means for rotating said threaded member and said screw.

t. In a lifting jack, a hollow standard having internal screw threads, a member rotatably mounted in said standard,and having threads engaging the threads of said standard, a screw rigidly secured to said member, a hollow lifting element havingin-- ternal screw threads to receive said screw,-

means for 'rotating said threaded member and said screw, andmeans for holding said lifting elementagainst rotation with relation to said standard.

5. In a lifting jack, a hollow standard having internal screw threads, a member rotatably mounted in said standard and hav ing threads engaging the threads of said rotatably mounted in said standard and hav? ing threads engaging the threads of said standard, an externally` threaded screw mounted in said standard and connected with said member foraxial movement therewith, a lifting element having threaded engage- Vment with said screw, a sleeve mounted about said lifting element between the same and said standard and having axial movement' with said threaded member, means to limit the axial movement of said sleeve and to hold same against rotation, means to lnnit the axial movement of saidlifting element with relation to 'said sleeve and to hold the same` against rotation with relation thereto, and

means for rotating said threaded member andsaidscrew.

7. In a lifting jack, a hollowfstanda'rd having internal screw threads, a member rotatably mounted in-said standard and-hav'` ing threads engaging the threads of lsaid.` an externally threaded screwmounted in said standard and connectedwith said member for axial movement therewith,"

standard,

a lifting 'element having threaded engage'-v ment with said screw, a` sleeve mounted about? said lifting element between the same and said standard and having longitudinal slots,` a stud carried by said standard and extending into one of said slots, a stud carried by4 said lifting element and extending into the other,` of said slots, and means for Y'rotating saidy threaded member and said screw;

i so

8. In a lifting jack, a hollow standard having internal screw threads, a nut rotatably mounted in said standard and engaging the threads thereof, a hollow lifting element mounted for axial movement in said standard and having an internally threaded portion,

,a screw rigidly secured to said nut and engaging the threaded portion of said lifting element, and means for rotating said nut and said screw. g

9. In a lifting jack, a hollow standard having internal screw threads, a nut rotatably mounted in said standard and engaging the threads thereof, a hollow lifting element mounted for axial movement in said standard and having an internally threaded portion, a screw rigidly secured to said nut and engaging the threaded portion of said lifting element, an actuating bar having slidable but non-rotatable connection with said nut and said screw, and means for rotating said bar.

10. In a lifting jack, a hollow standard having internal screw threads, a nut rotati ablv mounted in said standard and engaging thewthreads thereof, a hollow lifting element mounted for axial movement in said standard and having an internally threaded portion, a screw rigidly secured to said nut and engaging the threaded portion of said lifting element, an actuating bar having slidable butv non-rotatable connection with said nutvand said screw, a sleeve supported by and held against rotation with' said nut, extending about said lifting element and having means for holding said lifting element against rotat-ion, and means for rotating said bar.

11. In a lifting jack, a hollow standard having internal screw threads, a nut rotatably mounted in said standard and engaging the threads thereof, a hollow lifting element mounted for axial movement in said standard and having an internally threaded portion, a hollow screw engaging the threaded portion of said lifting element and having a portion extending through and rigidly secured to said nut, an actuating bar extending into said screw and held against rotation with relation thereto, and means for rotating said bar.

i2. In a lifting jack, a hollow standard having internal screw threads and having an enlarged lower portion forming a base, a nut mounted in the threaded portion ofsaid standard, a hollow lifting element mounted for axial movement in said standard and havinternally threaded standard, a vertically disposed driving spindle. rotatably mounted `in said standard 'andprovided with a beveled gear at-.its lower enda `driving gear mounted on 'said Vstandard'to coac't with said gear on said-Hspindle, an actuating screw having splined driving engagement with said spindie and `provided with a threaded lower Yportion coacting `with the threads'of said standard and with an oppositely threaded upper portion',a hollow lifting member telescopingly associatedwith the upper portion of said actuating screw'and having threaded engage- -ment therewith, a housing sleeveembracing said'upper portion of said screw and telescopingly associated therewith and kwith said standard, andl means for preventing rotation of said lifting member. i

le. In a lifting jack, the combination of an internally threaded standard, a vertically disposed. driving spindle rotatably mounted in said standard, an actuating screw havin `splined driving engagement with said spindle standard, and means for preventing rotation Y of said lifting member. v

15. In a lifting jack, the combination of an internally threaded standard, a vertically disposed driving spindle, an actuating screw having splined driving engagement with said spindle and'provided with a threaded lower portion coacting` with the threads of the standardand with anoppositely threaded upper portion, a lifting member having threaded engagement with the upper portion of the screw, avhousing member telescopingly associated with said standard arid lifting member, and means for preventing rotation of the lifting member. l

16. In a lifting jack, the combination of a standard having internal screw threads, a vertically disposed driving spindle, an actuating screw having splined driving engagement with said spindle and provided with a threaded lower portion coacting with the threads of the standard and with an externally and oppositely threaded upper portion, a lifting member havino' threaded engagement with the upper portion of the screw and means fror preventing rotation of said lifting member.

17. In a lifting jack, the combination of a standardhaving internal scr'ew threads, a i

vertically disposed driving spindle, an actuating screw having splined driving lengagement with said spindle and provided with a threaded lower portion coacting with the.

threads of the standard and with an externalfly, and oppositel'y threaded upper portion; a lifting member having threaded engagement with thenpper portion of the screw, andmeans collapsible. Within said standard for preventing'rthe rotation ofsaid lifting member.

, 18. In a lifting jack, the Combination of a standardv having internal screw threads, a vertically disposeddriving spindle, en actuating screw having splined driving engagement With said vspindle and provided'with a threaded lower portion coaeting With the `threads of the standard and with an eX- p ternally and oppositelythreaded upper portion, a lifting member having threaded engagement with the upper portion of the screw,

and a member telescopingly and non-rotatl ably associated with said standardy and lifting member. A l In testimony whereof, I atHX my signature hereto.

` ION VON KERT HOTT.

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